TalbotPlamondon2002a

Reference

Talbot, J., Plamondon, A.P. (2002) The diminution of snowmelt rate with forest regrowth as an index of peak flow hydrological recovery, Montmorency Forest, Québec. In Eastern Snow Conference. Pages 85-92.

Abstract

Watershed studies have demonstrated that clearcutting more than 50-60 % of a basin area can increase significantly spring peak flow. It is considered that this increase results from a combination of earlier snow ripening, higher snowmelt rate, lower rain interception and rainfall on a thinner snowpack as compared to the forested conditions. The decrease of the snowmelt rate in relation to the reestablishment of the forest cover after clearcutting is the object of this study. Snowmelt was measured during three spring periods in pairs of north and south exposed sites in clearcut areas and balsam fir stands ranging from 2 m to 13 m in height. We defined a snowmelt attenuation coefficient (1 – hydrologic recovery) which ranged from 100 % in open areas where the snowmelt rate increase was considered maximum, to 0 % for the north and south stands with the lowest average melt rate for the three springs. The lowest rates occurred in stands 7.4 m high with canopy densities (spherical densiometer) of 64 and 71 % for the north and south exposures respectively. The 13 m high mature stands had canopy densities of 71 and 79 % but less stems/ha suggesting a smaller vertical projected area of the crowns. The snowmelt attenuation coefficients (SAC) were not affected by the site exposition. The SAC reaches 20 % for stand height and canopy density of 6.2 m and 69 % canopy density.

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@INPROCEEDINGS { TalbotPlamondon2002a,
    AUTHOR = { Talbot, J. and Plamondon, A.P. },
    TITLE = { The diminution of snowmelt rate with forest regrowth as an index of peak flow hydrological recovery, Montmorency Forest, Québec. },
    BOOKTITLE = { Eastern Snow Conference },
    YEAR = { 2002 },
    VOLUME = { 22 },
    PAGES = { 85-92 },
    ABSTRACT = { Watershed studies have demonstrated that clearcutting more than 50-60 % of a basin area can increase significantly spring peak flow. It is considered that this increase results from a combination of earlier snow ripening, higher snowmelt rate, lower rain interception and rainfall on a thinner snowpack as compared to the forested conditions. The decrease of the snowmelt rate in relation to the reestablishment of the forest cover after clearcutting is the object of this study. Snowmelt was measured during three spring periods in pairs of north and south exposed sites in clearcut areas and balsam fir stands ranging from 2 m to 13 m in height. We defined a snowmelt attenuation coefficient (1 – hydrologic recovery) which ranged from 100 % in open areas where the snowmelt rate increase was considered maximum, to 0 % for the north and south stands with the lowest average melt rate for the three springs. The lowest rates occurred in stands 7.4 m high with canopy densities (spherical densiometer) of 64 and 71 % for the north and south exposures respectively. The 13 m high mature stands had canopy densities of 71 and 79 % but less stems/ha suggesting a smaller vertical projected area of the crowns. The snowmelt attenuation coefficients (SAC) were not affected by the site exposition. The SAC reaches 20 % for stand height and canopy density of 6.2 m and 69 % canopy density. },
}

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